export function HexMD5(instring: string) {
    var hexcase = 0 /* hex output format. 0 - lowercase; 1 - uppercase        */
    var b64pad = '' /* base-64 pad character. "=" for strict RFC compliance   */

    /*
     * These are the functions you'll usually want to call
     * They take string arguments and return either hex or base-64 encoded strings
     */
    function hex_md5(s: string) {
        return rstr2hex(rstr_md5(str2rstr_utf8(s)))
    }
    function b64_md5(s: string) {
        return rstr2b64(rstr_md5(str2rstr_utf8(s)))
    }
    function any_md5(s: string, e: string) {
        return rstr2any(rstr_md5(str2rstr_utf8(s)), e)
    }
    function hex_hmac_md5(k: string, d: string) {
        return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)))
    }
    function b64_hmac_md5(k: string, d: string) {
        return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)))
    }
    function any_hmac_md5(k: string, d: string, e: string) {
        return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e)
    }

    /*
     * Perform a simple self-test to see if the VM is working
     */
    function md5_vm_test() {
        return hex_md5('abc').toLowerCase() == '900150983cd24fb0d6963f7d28e17f72'
    }

    /*
     * Calculate the MD5 of a raw string
     */
    function rstr_md5(s: string) {
        return binl2rstr(binl_md5(rstr2binl(s), s.length * 8))
    }

    /*
     * Calculate the HMAC-MD5, of a key and some data (raw strings)
     */
    function rstr_hmac_md5(key: string, data: string) {
        var bkey = rstr2binl(key)
        if (bkey.length > 16) bkey = binl_md5(bkey, key.length * 8)

        var ipad = Array(16),
            opad = Array(16)
        for (var i = 0; i < 16; i++) {
            ipad[i] = bkey[i] ^ 0x36363636
            opad[i] = bkey[i] ^ 0x5c5c5c5c
        }

        var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8)
        return binl2rstr(binl_md5(opad.concat(hash), 512 + 128))
    }

    /*
     * Convert a raw string to a hex string
     */
    function rstr2hex(input: string) {
        try {
            hexcase
        } catch (e) {
            hexcase = 0
        }
        var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef'
        var output = ''
        var x
        for (var i = 0; i < input.length; i++) {
            x = input.charCodeAt(i)
            output += hex_tab.charAt((x >>> 4) & 0x0f) + hex_tab.charAt(x & 0x0f)
        }
        return output
    }

    /*
     * Convert a raw string to a base-64 string
     */
    function rstr2b64(input: string) {
        try {
            b64pad
        } catch (e) {
            b64pad = ''
        }
        var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
        var output = ''
        var len = input.length
        for (var i = 0; i < len; i += 3) {
            var triplet = (input.charCodeAt(i) << 16) | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0) | (i + 2 < len ? input.charCodeAt(i + 2) : 0)
            for (var j = 0; j < 4; j++) {
                if (i * 8 + j * 6 > input.length * 8) output += b64pad
                else output += tab.charAt((triplet >>> (6 * (3 - j))) & 0x3f)
            }
        }
        return output
    }

    /*
     * Convert a raw string to an arbitrary string encoding
     */
    function rstr2any(input: string, encoding: string) {
        var divisor = encoding.length
        var i, j, q, x, quotient

        /* Convert to an array of 16-bit big-endian values, forming the dividend */
        var dividend = Array(Math.ceil(input.length / 2))
        for (i = 0; i < dividend.length; i++) {
            dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1)
        }

        /*
         * Repeatedly perform a long division. The binary array forms the dividend,
         * the length of the encoding is the divisor. Once computed, the quotient
         * forms the dividend for the next step. All remainders are stored for later
         * use.
         */
        var full_length = Math.ceil((input.length * 8) / (Math.log(encoding.length) / Math.log(2)))
        var remainders = Array(full_length)
        for (j = 0; j < full_length; j++) {
            quotient = Array()
            x = 0
            for (i = 0; i < dividend.length; i++) {
                x = (x << 16) + dividend[i]
                q = Math.floor(x / divisor)
                x -= q * divisor
                if (quotient.length > 0 || q > 0) quotient[quotient.length] = q
            }
            remainders[j] = x
            dividend = quotient
        }

        /* Convert the remainders to the output string */
        var output = ''
        for (i = remainders.length - 1; i >= 0; i--) output += encoding.charAt(remainders[i])

        return output
    }

    /*
     * Encode a string as utf-8.
     * For efficiency, this assumes the input is valid utf-16.
     */
    function str2rstr_utf8(input: string) {
        var output = ''
        var i = -1
        var x, y

        while (++i < input.length) {
            /* Decode utf-16 surrogate pairs */
            x = input.charCodeAt(i)
            y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0
            if (0xd800 <= x && x <= 0xdbff && 0xdc00 <= y && y <= 0xdfff) {
                x = 0x10000 + ((x & 0x03ff) << 10) + (y & 0x03ff)
                i++
            }

            /* Encode output as utf-8 */
            if (x <= 0x7f) output += String.fromCharCode(x)
            else if (x <= 0x7ff) output += String.fromCharCode(0xc0 | ((x >>> 6) & 0x1f), 0x80 | (x & 0x3f))
            else if (x <= 0xffff) output += String.fromCharCode(0xe0 | ((x >>> 12) & 0x0f), 0x80 | ((x >>> 6) & 0x3f), 0x80 | (x & 0x3f))
            else if (x <= 0x1fffff)
                output += String.fromCharCode(0xf0 | ((x >>> 18) & 0x07), 0x80 | ((x >>> 12) & 0x3f), 0x80 | ((x >>> 6) & 0x3f), 0x80 | (x & 0x3f))
        }
        return output
    }

    /*
     * Encode a string as utf-16
     */
    function str2rstr_utf16le(input: string) {
        var output = ''
        for (var i = 0; i < input.length; i++) output += String.fromCharCode(input.charCodeAt(i) & 0xff, (input.charCodeAt(i) >>> 8) & 0xff)
        return output
    }

    function str2rstr_utf16be(input: string) {
        var output = ''
        for (var i = 0; i < input.length; i++) output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xff, input.charCodeAt(i) & 0xff)
        return output
    }

    /*
     * Convert a raw string to an array of little-endian words
     * Characters >255 have their high-byte silently ignored.
     */
    function rstr2binl(input: string) {
        var output = Array(input.length >> 2)
        for (var i = 0; i < output.length; i++) output[i] = 0
        for (var i = 0; i < input.length * 8; i += 8) output[i >> 5] |= (input.charCodeAt(i / 8) & 0xff) << i % 32
        return output
    }

    /*
     * Convert an array of little-endian words to a string
     */
    function binl2rstr(input: any) {
        var output = ''
        for (var i = 0; i < input.length * 32; i += 8) output += String.fromCharCode((input[i >> 5] >>> i % 32) & 0xff)
        return output
    }

    /*
     * Calculate the MD5 of an array of little-endian words, and a bit length.
     */
    function binl_md5(x: any, len: any) {
        /* append padding */
        x[len >> 5] |= 0x80 << len % 32
        x[(((len + 64) >>> 9) << 4) + 14] = len

        var a = 1732584193
        var b = -271733879
        var c = -1732584194
        var d = 271733878

        for (var i = 0; i < x.length; i += 16) {
            var olda = a
            var oldb = b
            var oldc = c
            var oldd = d

            a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
            d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
            c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
            b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
            a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
            d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
            c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
            b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
            a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
            d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
            c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
            b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
            a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
            d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
            c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
            b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)

            a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
            d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
            c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
            b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
            a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
            d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
            c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
            b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
            a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
            d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
            c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
            b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
            a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
            d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
            c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
            b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)

            a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
            d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
            c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
            b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
            a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
            d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
            c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
            b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
            a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
            d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
            c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
            b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
            a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
            d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
            c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
            b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)

            a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
            d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
            c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
            b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
            a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
            d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
            c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
            b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
            a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
            d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
            c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
            b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
            a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
            d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
            c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
            b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

            a = safe_add(a, olda)
            b = safe_add(b, oldb)
            c = safe_add(c, oldc)
            d = safe_add(d, oldd)
        }
        return Array(a, b, c, d)
    }

    /*
     * These functions implement the four basic operations the algorithm uses.
     */
    function md5_cmn(q: any, a: any, b: any, x: any, s: any, t: any) {
        return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
    }
    function md5_ff(a: any, b: any, c: any, d: any, x: any, s: any, t: any) {
        return md5_cmn((b & c) | (~b & d), a, b, x, s, t)
    }
    function md5_gg(a: any, b: any, c: any, d: any, x: any, s: any, t: any) {
        return md5_cmn((b & d) | (c & ~d), a, b, x, s, t)
    }
    function md5_hh(a: any, b: any, c: any, d: any, x: any, s: any, t: any) {
        return md5_cmn(b ^ c ^ d, a, b, x, s, t)
    }
    function md5_ii(a: any, b: any, c: any, d: any, x: any, s: any, t: any) {
        return md5_cmn(c ^ (b | ~d), a, b, x, s, t)
    }

    /*
     * Add integers, wrapping at 2^32. This uses 16-bit operations internally
     * to work around bugs in some JS interpreters.
     */
    function safe_add(x: any, y: any) {
        var lsw = (x & 0xffff) + (y & 0xffff)
        var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
        return (msw << 16) | (lsw & 0xffff)
    }

    /*
     * Bitwise rotate a 32-bit number to the left.
     */
    function bit_rol(num: any, cnt: any) {
        // eslint-disable-next-line no-bitwise
        return (num << cnt) | (num >>> (32 - cnt))
    }

    return hex_md5(instring)
}
